Shaft coupling



. A. MARTIN SHAFT COUPLING March 6, 1928. 1,661,226

Original Filed Aug. 27, 1924 (\l n lNVENTOR E (n a flXWfiZ/W andparticularly to meansj'for assembling I pling whereby a pluralityof'adjustably con-" I n I n tion of the inner tapered ends of the shafts8 and 10, l

UNITED STATE ARTHUR men'rxm or rrrrsnunen, PENNSYLVANIA.

8mm cournme.

Original application filed August-27, 924, Serial'No. 734,464. mvmaethis application and d February 20,1925. Serial No. 10,595.

My invention relates-t0 shaftocou'plings said shafts in predetermineddefinite relation to oneanotherp 1 V f My invention has for its 'object'the provision of an improved'form of shaft cou- .vide .a joint oftapered form betwee n two.

shafts and means for effecting tight contact between theco-operatingengaging surfaces Still anotherjobject 'of my invent on is to provideimproved means for conveniently removing a tapered member froma-complementally formed. sea-t without danger of injuring the parts; p

For convenience I haveshown my HIV-e111 tion as employed in connectionwith a detachable unit. drive for sewing machines, but it willbeunderstood that'it may belused in connection with various types ofmechanisms. r v

One form which my invention may take is shown in the. accompanyingdrawing wherein'Fig. 1 is a sectional view in side elevation of a driveunit embodying my invention and a portion of a sewing machine to whichsaid unit is applied; Fig. 2 is an enlarged detail view, partially insection, of"

my improved form of coupling shown in Fig. 1, and Fig. 3 is a view takenon the line 3-3ofFig.. n

This application constitutes adivislon of my copending application,Serial No. 734,464, filed August 27 1924.

The apparatus is shown as applied'to a sewing machine casing 5 that 1contains a bearing 6 having a needle bar operating shaft 8 (only aportion of :which is shown),

and a bearing 9 for atransmission shaft 10. 1

The sewing machine mechanism, which is not shown, may be of conventionalform.

I provide an auxiliary casing or housingthat are secured in place byscrews 17 whichhave threaded engagement with the casing" end of theshaft/8, the end of which is cham- 11. The casing 11 is also providedwith the shaft'20 and 22 by means ofthe usual two forwardly extending"outward hearing.

portions 181that are adapted-toseatwithin 5 accuratelybored openings 19'f o'rmed in' the casing 5. Two-three throwcrank shafts20 and 22aresupport'ed in bearings 15 and 16.1 and are provided on their inner,ends with tapered coupling'soc kets 21 for thercep-V The shaft 2( isdriven by a bandlwhee] pulley 23 and drives the shaft 22 through. themedium ofthre'e connecting rods 24. that are joined at their respectiveends. to

straps joined to such shafts. 1 "g By unscrewing the screws12 it willbe.

' seen that the housing 11' and the crank shafts andother mechanismcarried thereby can be 5, to permit access to t eQmechanismJforinspect'ioi' and repairs. .Inassembling the removed fromthe castin'or'main housing 8 and 10, respectively. The shafts 8-and 10 must-haveproper relative circumferential ad ustment so that the mechanisms notshown to which their outer endsare connected will operate in properlytimed relation.

For the purpose of effecting this circumferential adjustment, I provideeach of'the shafts 8 and 10 with a longitudinal V-shaped Slot 26 havinga radius'on the edges as shown at 26 into which the tapered inner endsof screw 27 that are carried by the coupling sockets 21 may be driven,thereby in'-- suring that the shafts will occupy a definitepredetermined circumferential relation. The shafts 8 and 10 are alsoeach provided with a tapered recess or spot hole 28 forthe reception ofa set screw 29. 1 The axes of each 9 recess 28 and its associated screw29 are normally offset longitudinally ofthe shaft so that as the screwis driven ho'me,the shaft 8, for example, will bedrawn snugly to itsseat within the socket 21. 1 v

'Thesockets 21 are also each provided with a screw 30 that is slightlytapered at its inner end so that it may have an extended tapered surfaceengagement with the inner fered to the same taper as the screw 30. The

V unit from the main frame 5. The extended screw 30 is provided for thepurpose of starting the shaft 8 from its seat when it is desired todisconnect the detachable drive surface just referred to avoidsdistortion of either the metal of the screw or theencl of the shaftunder the pressure often required to start the shaft from its seatwithin the socket 21.

Openings 31 and 32 are provided in the walls of the housing, ofsufiicient size to permit entry of a screw driver for the purpose ofoperating the screws 27, 29 and 80 when assembling and disassembling theparts. Thus the only assemblingoperations required to be made from theexterior of the tapered shafts to seat the ends of the shafts of saidmechanism. 7 I

It will be apparent that the shafts 8 and 10 may be provided with thesockets and the inner ends of the crank shafts 20 and 22 tapered to, fitsaid sockets, and that various other changes may be madewithout'departing from the spirit and scope ofthe invention as definedin the accompanying claims.

I claim as my, invention 2 '1. Drivingmech'anism comprising a drivingshaft, a'driven shaft, one of said shafts having a tapered end and theother being provided with a tapered socket, a setscrew carried by thesocket andhaving a tapered point, the tapered shaft end having a recessadapted to be engaged said tapered screw;

point, the said recess and screw being nor-- mally slightly offsetlongitudinally of the shaft so that when the screw is driven down thetapered shaft end'will be drawn tightly to its seat within the socket,and a second tapered screw carried by said socket in position to bebrought into engagement withtheend of said tapered shaft when drawn toits seat by the first-named screw and start it from its seat. i

2. Driving mechanism comprising a driving shaft, a driven shaft, one ofsaid shaftshaving a tapered end and the 'otherbeing provided with atapered socket, the tapered shaft having a recess, and tapered setscrews carried by said socket one of which isin positionto engage saidrecess toforce the tar pered shaft into the tapered socket and theother. of which is in position to start the shaft from said socket. Intestimony whereof I the said ARTHUR MARTIN have hereunto set my hand. 7Y ARTHUR 'MARTINQ;

